Open-Circuit Fault Analysis and Recognition in Three-Level Inverters Based on Recurrence Plot and Convolution Neural Network

Table 1

Classification of the IGBT open-circuit fault of a three-level inverter.

Type	Fault type	Fault location
1	IGBT operates normally without fault	None
2	Only one IGBT fails	S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12
3	Two IGBTs of different half bridges of the same bridge arm fail simultaneously	S1S3, S1S4, S2S3, S2S4, S5S7, S5S8, S6S7, S6S8, S9S11, S9S12, S10S11, S10S12
4	Two IGBTs of the same half bridge of the same bridge arm fail simultaneously	S1S2, S3S4, S5S6, S7S8, S9S10, S11S12
5	Two IGBTs of the same half bridge with different bridge arms fail	S1S5, S1S6, S1S9, S1S10, S2S5, S2S6, S2S9, S2S10, S5S9, S5S10, S6S9, S6S10, S3S7, S3S8, S3S11, S3S12, S4S7, S4S8, S4S11, S4S12, S7S11, S7S12, S8S11, S8S12
6	Two IGBT faults of cross-connection (different bridge arms and different half bridges)	S1S7, S1S8, S1S11, S1S12, S2S7, S2S8, S2S11, S2S12, S5S3, S5S4, S5S11, S5S12, S6S3, S6S4, S6S11, S6S12, S9S3, S9S4, S9S7, S9S8, S10S3, S10S4, S10S7, S10S8